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| The TCP/IP model (RFC 1122) |
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In computer networking, the Reliable User Datagram Protocol (RUDP) is a transport layer protocol designed at Bell Labs for the Plan 9 operating system. It aims to provide a solution where UDP is too primitive because guaranteed-order packet delivery is desirable, but TCP adds too much complexity/overhead.
It extends UDP by adding the following additional features:
- Acknowledgment of received packets
- Windowing and congestion control
- Retransmission of lost packets
- Overbuffering (Faster than real-time streaming)
RUDP is not currently a formal standard, however it was described in an IETF internet-draft in 1999. It has not been proposed for standardization.
Microsoft R-UDP
Microsoft has introduced another protocol they refer to as R-UDP. It is used in their MediaRoom product for IPTV service delivery over multicast networks. This is a proprietary protocol and very little is known about its operation. It is not thought to be based on the above referenced IETF draft.
